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Chemical Sensor Research Group, Department of Chemistry, Kwangwoon University, Seoul 139-701, KoreaReceived April 20, 2004A short and efficient synthesis, solvent extraction and potentiometric measurements of new thiazole-containingnaphtho-crown ethers are reported. The naphthalene moiety enhances the ammonium ion selectivity overpotassium ion. The selectivity of NH

Ammonium Ion Binding Property of Naphtho-Crown Ethers Containing Thiazole as Sub-Cyclic Unit